[ACCEPTED]-Cannot Checkin in TFS 2013 - Value cannot be null Parameter name: format-tfs

Accepted answer
Score: 63

I got similar issue. It got resolved by 2 closing the visual studio and opening it 1 again.

Score: 2

For anyone using VS2017:

I was able to resolve 2 by clearing the contents of the cache folder 1 first:

C:\Users\UserName\AppData\Local\Microsoft\Team Foundation\7.0\Cache

Restart and Run As Admin and it should be resolved.

Score: 1

Do you have the applicable updates for VS2012 5 to connect to VS2013?

According to Compatibility between Team Foundation clients and Team Foundation Server, under 4 TFS 2013 client support for VS2012:

Requires latest Visual Studio 3 2012 update. Supports Git with Visual Studio 2 Tools for Git extension.

The latest VS2012 1 update is Update 4.

Score: 1

I had the same error message when I tried 4 to annotate a field with RegularExpression 3 data annotation and the error message I 2 tried to get from Resources didn't exist 1 (a merge issue).

    public Nullable<decimal> Latitude { get; set; }
Score: 1

Possibly your visual studio needs to be 1 opened with a "Run as administrator"

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